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Synonyms
keen1 (kēn)

[Middle English kene, from Old English cēne, brave.]

adjective: keen·er, keen·est. 

  1. Having a fine, sharp cutting edge or point.
  2. Having or marked by intellectual quickness and acuity. See synonyms at sharp
  3. Acutely sensitive: a keen ear.
  4. Sharp; vivid; strong: “His entire body hungered for keen sensation, something exciting” (Richard Wright)
  5. Intense; piercing: a keen wind.
  6. Pungent; acrid: A keen smell of skunk was left behind.
    1. Ardent; enthusiastic: a keen chess player.
    2. Eagerly desirous: keen on going to Europe in the spring.
  7. Slang Great; splendid; fine: What a keen day!

derivatives

keeńly
adverb
keeńness
noun